Overall, a good tourist experience. We bought tickets online a couple pf hours in advance on the Circle Line website. That saves waiting in a long line and I recommend it. The only negative we encountered was at the beginning -- the security people were very rude to customers waiting to get on board. Comments like "Act like you want to get on the boat" are offensive and totally rude. Once we got onboard, the open seating was comfortable. Sat inside because it was quite hot, but it was easy to get outside for better views if you want to do that. On the Landmarks tour, don't worry about sitting port or starboard, because the boat does a loop and you get to see the city skyline from either side. Our guide, David, was excellent. The 1.5 hour length is just right.